chore: align srcDir=app structure (assets, composables, stores, plugins, pages) and prepare for correct alias resolution

app/assets/css/main.css

@@ -1,2 +1,4 @@
 @import "tailwindcss";
 @import "@nuxt/ui";
+
+

nuxt.config.ts

@@ -13,8 +13,8 @@ export default defineNuxtConfig({
     strict: true,
   },
 
-  // Global CSS
-  css: ["~/assets/css/main.css"],
+  // Global CSS (use app/ path due to Nuxt 4 app/ srcDir handling)
+  css: ["/app/assets/css/main.css"],
 
   // PostCSS configured separately
 

server/api/fixtures.get.ts

@@ -1,10 +1,8 @@
-import { defineEventHandler } from 'h3'
-import { useFixtureIO } from '#imports'
+import { defineEventHandler } from "h3";
+import { useFixtureIO } from "~/composables/useFixtureIO";
 
 export default defineEventHandler(() => {
   // Export snapshot of in-memory state
-  const { exportAll } = useFixtureIO()
-  return exportAll()
-})
-
-
+  const { exportAll } = useFixtureIO();
+  return exportAll();
+});

server/api/fixtures.post.ts

@@ -1,5 +1,5 @@
 import { defineEventHandler, readBody } from "h3";
-import { useFixtureIO, type AppSnapshot } from "#imports";
+import { useFixtureIO, type AppSnapshot } from "~/composables/useFixtureIO";
 
 export default defineEventHandler(async (event) => {
   const body = (await readBody(event)) as AppSnapshot;